Anecdotal, but I do feel this when reading documentation for commercial products. I start to wonder, often unconsciously, whether the documentation is outdated

Anecdotal, but I do feel this when reading documentation for commercial products. I start to wonder, often unconsciously, whether the documentation is outdated (so, following it may lead to an error), or there isn't a good cooperation between designers and documentation writers (and the possibility that those are different people/teams doesn't feel too well, either), or the UI changes very rapidly (so I can expect possibly unwanted changes once I learn something).